Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Joseph Mack, MD

Psychiatry Physician in Leawood, KS · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1598704736

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Registry record

Entity type Individual (Type 1)

Name Dr. William Joseph Mack

Credential MD

Sex Male

Practice address 11111 Nall Ave, Suite 103, Leawood, KS, 66211

Phone (913) 314-3495

Enumeration date Jun 5, 2006

Last updated in NPPES Jun 22, 2012

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 04-35486 (KS) Primary

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 2011036813 (MO) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How do I verify William Mack's NPI record?

Cross-check NPI 1598704736 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1598704736 active?

Yes, as of the latest NPPES snapshot, NPI 1598704736 is active (record last updated 2012-06-22).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-06-22.